# OpenDose3D: DICOMError - Attribute 'acquisition' is empty (Siemens SPECT-CT)

**URL:** <https://discourse.slicer.org/t/opendose3d-dicomerror-attribute-acquisition-is-empty-siemens-spect-ct/41392>\
**Category:** Support\
**Tags:** opendose3d\
**Created:** [January 31, 2025, 5:12am UTC](https://discourse.slicer.org/t/opendose3d-dicomerror-attribute-acquisition-is-empty-siemens-spect-ct/41392 "2025-01-31T05:12:16Z")\
**Posts on this page:** 6\
**Page:** 1

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**Author:** ![Angie\_Tatiana\_Marin](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/angie_tatiana_marin/32/77719_2.png) [@Angie\_Tatiana\_Marin](https://discourse.slicer.org/u/Angie_Tatiana_Marin)\
**Post date:** [January 31, 2025, 5:12am UTC](https://discourse.slicer.org/t/opendose3d-dicomerror-attribute-acquisition-is-empty-siemens-spect-ct/41392/1 "2025-01-31T05:12:16Z")

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Hello everyone,

I am using **3D Slicer 5.6.2** with the **OpenDose3D** module to process SPECT-CT images from a **Siemens scanner** for quantitative imaging with **Lu-177, Tc-99m, and I-131**. However, I am encountering the following error:  
**Logic.errors.DICOMError: Attribute ‘acquisition’ is empty**

However, when I inspect the DICOM metadata (using Slicer’s DICOM browser), the relevant tags are present:

- `(0008,0020) Study Date: 20240813`
- `(0008,0022) Acquisition Date: 20240813`
- `(0008,0030) Study Time: 180138.383000`
- `(0008,0032) Acquisition Time: 183453.468508`

It seems that OpenDose3D does not recognize the `AcquisitionDate` and `AcquisitionTime` values, even though they are correctly stored in the DICOM headers.  
I am running **Windows 10** and using the latest OpenDose3D extension.

Has anyone encountered a similar issue with Siemens DICOM files? Any advice would be greatly appreciated. Thanks!

Uploading: dicomtags.jpg…  
Uploading: error.jpg…

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**Author:** ![Alex\_Vergara](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/alex_vergara/32/15205_2.png) [@Alex\_Vergara](https://discourse.slicer.org/u/Alex_Vergara)\
**Post date:** [January 31, 2025, 1:07pm UTC](https://discourse.slicer.org/t/opendose3d-dicomerror-attribute-acquisition-is-empty-siemens-spect-ct/41392/2 "2025-01-31T13:07:00Z")

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Please create an issue here [Issues · OpenDose / SlicerOpenDose3D · GitLab](https://gitlab.com/opendose/opendose3d/-/issues)

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**Author:** ![fragosoj](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/fragosoj/32/14395_2.png) [@fragosoj](https://discourse.slicer.org/u/fragosoj)\
**Post date:** [January 31, 2025, 2:19pm UTC](https://discourse.slicer.org/t/opendose3d-dicomerror-attribute-acquisition-is-empty-siemens-spect-ct/41392/3 "2025-01-31T14:19:20Z")

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OpenDose3D should work smoothly if the Acquisition Date is stored.

Could you please check that **all** your images have the Acquisition Date and modality correctly stored?

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**Author:** ![akmal871026](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/akmal871026/32/11642_2.png) [@akmal871026](https://discourse.slicer.org/u/akmal871026)\
**Post date:** [February 9, 2025, 7:47am UTC](https://discourse.slicer.org/t/opendose3d-dicomerror-attribute-acquisition-is-empty-siemens-spect-ct/41392/4 "2025-02-09T07:47:36Z")

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Dear @Angie_Tatiana_Marin ,

Actually, the DICOM attribute from SIEMENS are quite tricky. Some of the parameter for example acquisition time and date, they address with the different name.

I my experience, the “number of angular” is represents the “projection angle” something like that. You have to check particularly.

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**Author:** ![Angie\_Tatiana\_Marin](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/angie_tatiana_marin/32/77719_2.png) [@Angie\_Tatiana\_Marin](https://discourse.slicer.org/u/Angie_Tatiana_Marin)\
**Post date:** [February 10, 2025, 2:39am UTC](https://discourse.slicer.org/t/opendose3d-dicomerror-attribute-acquisition-is-empty-siemens-spect-ct/41392/5 "2025-02-10T02:39:06Z")

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Hello, I already checked the dicomtags of the images, and they all have the information. I don’t know how to solve this.  
How can it be corrected?

Thank you

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**Author:** ![akmal871026](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/akmal871026/32/11642_2.png) [@akmal871026](https://discourse.slicer.org/u/akmal871026)\
**Post date:** [February 24, 2025, 1:19am UTC](https://discourse.slicer.org/t/opendose3d-dicomerror-attribute-acquisition-is-empty-siemens-spect-ct/41392/6 "2025-02-24T01:19:58Z")

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Dear @Angie_Tatiana_Marin , try look up at “ **MRML node information** ”